Guess I'm old-school, but between lower weight and stronger design/ built, I choose the latter. I stand to be corrected, but isn't the AT the only adv bike with a double cradle frame!? The rest all use the engine as a stressed member underneath a roadish frame, with the subsequent mounting of bash plates onto the engine casing... This 800 KTM also seems to lack any sort of frame underneath the engine .- just like the GS and XCX....
Seeing it in that light - the AT is light given its design/build strenght!